Page 114 - Villas at Savona Close-out Manual

After securing the grate to the cast-iron ring, a layer of ultraviolet-resistant geotextile fabric is applied over
the grate. This UV-resistant fabric layer is banded to the grated inlet, and is intended to prevent incidental
introduction of trash or debris before the well goes into service. This fabric will be removed by the General
Contractor after final landscaping and paving are completed. Premature fabric removal could result in
system damage and may void some, or all warranty conditions.

The metal grates and covers used are embossed with the Torrent Resources company name, the MaxWell
trade name, and the words “Storm Water Only” as a general reminder to the public as to the intended
usage of the structure.

The final step in the installation process is the application of a mortar mix to affix the ring and grate
assemblies securely to the manhole cones. This completes the construction sequence.

MaxWell Operation

Incoming water from the surface grated inlets or connecting pipes is received in the primary settling
chamber where silt and other heavy particles settle to the bottom. A vented, screened and shielded inlet
ensures containment of floating debris within the chamber, and elimination of petroleum constituents
through two floating absorbent pillows. When installed in optimum drainage materials, the pre-treated flow
is then regulated to a maximum design rate of up to 0.25 cfs, and directed to a secondary settling chamber.
Here the pre-treatment separation and containment process is repeated, thereby effectively achieving

controlled, uniform treatment. The system is drained as water rises under the PureFlo Debris Shield, and
spills into the top of the overflow pipe. The drainage assembly returns the cleaned water to the surrounding
soil through the FloFast Drainage Screen.


To provide prompt removal of pavement oils, both MaxWell Plus settling chambers are equipped with two
absorbent pillows. These floating pillow-like devices are 100 percent water repellent and literally wick
petrochemical compounds from the water. Each sponge has a capacity of at least 100 ounces to
accommodate effective, long-term treatment. These absorbent pillows are completely inert, and will safely
remove runoff constituents down to rainbow sheens which are typically no more than one molecule thick.

All MaxWell Plus Systems are equipped with bolted, theft-deterrent cast iron grates and covers as standard
security features. Special inset castings are available for use in landscaped applications, which are
resistant to loosening from accidental impact. Machined mating surfaces, and “Storm Water Only” wording
are standard on these components.

Maintenance

The responsible party, such as a Property Management Company or Homeowners Association, is typically
responsible for maintaining the drywell(s).

New systems should receive a thorough visual examination following the first several significant rainfall
events. This assessment will assure that there is no standing water, and that runoff or nuisance water flows
are being eliminated within the allowable 48 hour draw-down timeframe. Beyond that, the drainage
structures should be inspected once a year and within 48 hours of a significant storm event to ensure that
there is no standing water in the chambers.

Standing water problems are usually caused by inadequate performance of the existing drainage systems
on the property. Reasons are varied but may be due to system aging, reduced soil permeability, pavement
settlement, ineffective site maintenance, property expansions and additions, or change in property usage.

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